Abstract
HE analyses of genetic variations for most quantitative traits in diploid animals have often been made on the assumption that a majority of genes governing such traits are located on autosomal chromosomes. In a few instances, however, it has been found that the sex chromosomes might carry a considerable portion of the genes for a quantitative trait (e.g. chaetae number of D. melanogaster studied by MATHER 1942). The basic principle for determining the existence of sex-linked genes for a certain trait is to investigate the pattern of variation associated with the transmission of sex chromosomes. Sometimes the investigation can be much facilitated by the use of tester stocks with appropriate markers. Unfortunately, however, such tester stocks are not readily available for the quantitative genetics studies with most organisms. The objective of this paper is to report the results of three different experiments which all point to the existence of sex-linked genes governing a major portion of genotypic variation of a quantitative trait in a population of Drosophila.
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